To solve for h, we must isolate it in one side of the equation. So we start here:

All operations must be done in both sides, so the euqality is maintained. We can start by multiplying both sides by 4, which wil remove the fraction:

Now, let's invert the equation, so that h is on the left side:

Now we can substract g from both sides:

Finally, we can add k in both sides:

And so we solved for h.